ANTLR4 SQL Grammar from Apache Tajo project

[Kang Chen]

Hi Guys,

      I downloaded the SQL grammar files of Apache Tajo project(https://github.com/apache/incubator-tajo/tree/master/tajo-core/tajo-core-backend/src/main/antlr4/org/apache/tajo/engine/parser) and try it :

      

      > antlr4  SQLParser.g4 SQLLexer.g4

      > javac *.java

      > grun SQLParser sql -gui

      but it gives an error message:

      >java org.antlr.v4.runtime.misc.TestRig SQLParser sql -tokens

       Exception in thread "main" java.lang.ClassCastException: class SQLParser

                   at java.lang.Class.asSubclass(Class.java:3126)

                   at org.antlr.v4.runtime.misc.TestRig.process(TestRig.java:159)

                   at org.antlr.v4.runtime.misc.TestRig.main(TestRig.java:143)

     Any suggestions ?   antlr version is 4.2.1

[Terence Parr]

hi. a classpath issue.you might check here:

https://theantlrguy.atlassian.net/wiki/display/ANTLR4/Getting+Started+with+ANTLR+v4

Ter

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[Kang Chen]

It seems not a classpath issue, I resolved it by :

  

change: 

      parser grammar SQLParser;

to :

grammar SQLParser;

import SQLLexer;

delete:

options {

	language=Java;
	tokenVocab=SQLLexer;
 }

then: 
    antlr4 SQLParser.g4
    javac *java
    grun SQLParser sql -gui

and it works